Regardless of whether you are a seasoned developer or a designer or a complete newbie, (re)familiarizing yourself with the software and basic terminology is a good place to start. Here is a list of tips all Flash users should know.

Frame rate -> 12fps for mobile phones, 18fps to 30fps for general usage

Scene -> Please do not use scenes, it is outdated and unstable

Time line -> Onion skin is good for working with multiple frames

Library -> Ctrl + L

Button -> Try not to use it because it is very inflexible as compared to the movie clip (more another time)

Graphics -> Great for animation as it has live preview from the timeline